accuracy

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Recent Methods for Evaluating GNSS Receiver Accuracy and Reliability

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By Shahabuddin Amerudin Global Navigation Satellite System (GNSS) receivers are vital in Geographic Information Systems (GIS), serving as the foundation for accurate spatial data collection. These systems are integral to a wide range of applications, including urban planning, precision agriculture, infrastructure development, and environmental monitoring, all of which demand high positional accuracy for reliable decision-making. Achieving sub-meter accuracy is essential, as even small positional errors can have significant implications, such as misalignment in land parcel delineation or imprecise application of resources in precision agriculture (Lachapelle & El-Rabbany, 2021). GNSS receivers, however, vary in performance due to factors like environmental conditions, […]

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Factors Affecting Height Accuracy in Global Navigation Satellite Systems (GNSS)

By • • Knowledge, Project, Public, Research, Teaching • , , , , • 9 minutes of reading

By Shahabuddin Amerudin Abstract Global Navigation Satellite Systems (GNSS), with the Global Positioning System (GPS) as the most prominent example, have transformed the field of geospatial positioning, enabling precise location determination for a multitude of applications. While GNSS provides remarkable accuracy in horizontal position measurements, the accuracy of height measurements remains subject to various influencing factors. This article conducts an in-depth and comprehensive review of the factors impacting height accuracy in GNSS measurements, along with exploring the diverse techniques and technologies deployed to enhance height precision. Additionally, this paper delves into the practical applications of high-precision height measurements in geodesy,

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Enhancing Smartphone GNSS Accuracy with External Receivers

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By Shahabuddin Amerudin In an era driven by digital navigation and geospatial accuracy, the fusion of smartphones and external GNSS receivers has revolutionized positioning capabilities. With the proliferation of location-based services, achieving sub-meter accuracy with smartphones has become a tantalizing possibility. In this article, we explore how to realize this feat, including a dive into cost-effective external receivers that can elevate your smartphone’s positioning prowess. Smartphone GNSS: The Foundation Modern smartphones are equipped with built-in GNSS modules that tap into constellations like GPS, GLONASS, Galileo, and BeiDou, providing basic positioning services. However, their inherent limitations, such as susceptibility to signal

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Unleashing Sub-Meter Accuracy with L1 and L5 GNSS Frequencies

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By Shahabuddin Amerudin Introduction In the realm of modern navigation and geospatial technology, achieving unparalleled accuracy has become a driving force. As industries and individuals seek to unlock the potential of location-based services, the fusion of advanced GNSS technology with smartphones and external receivers has become a game-changer. One of the pivotal benchmarks in this quest is the pursuit of sub-meter accuracy – a feat that was once confined to specialized equipment but is now within reach through innovative approaches. The confluence of two significant GNSS frequency bands, L1 and L5, stands as a beacon of hope for realizing sub-meter

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GIS Applications That Demand Sub-Meter Accuracy

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By Shahabuddin Amerudin Sub-meter accuracy is essential for a variety of Geographic Information System (GIS) applications that require precise spatial data collection, mapping, and analysis. Here are some GIS applications that benefit from sub-meter accuracy: While sub-meter accuracy is critical for these applications, it’s important to choose the appropriate level of accuracy based on the specific requirements of the project. In many cases, sub-meter accuracy provides a balance between precision and cost-effectiveness, making it a valuable asset in various GIS applications. Suggestion for Citation: Amerudin, S. (2023). GIS Applications That Demand Sub-Meter Accuracy. [Online] Available at: https://people.utm.my/shahabuddin/?p=6616 (Accessed: 14 August

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How to Achieve Sub-Meter Positioning Accuracy using Smartphone

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By Shahabuddin Amerudin Achieving sub-meter positioning accuracy using a smartphone involves utilizing a combination of techniques, technologies, and tools that optimize the device’s built-in Global Navigation Satellite System (GNSS) capabilities. While smartphones typically offer less precise positioning compared to dedicated high-end GNSS receivers, advancements in hardware and software have enabled the enhancement of smartphone-based positioning accuracy. Here’s how to achieve sub-meter accuracy: It’s important to note that achieving sub-meter accuracy with a smartphone might still have limitations, especially in challenging environments like urban canyons or densely vegetated areas. The choice of method depends on the specific requirements of your application

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Pioneering High-Accuracy GNSS Positioning with Low-Cost Receivers and Smartphones

By • • Knowledge, Project, Public, Research, Teaching • , , , , , , • 4 minutes of reading

By Shahabuddin Amerudin Introduction In the dynamic landscape of navigation and positioning technology, a remarkable breakthrough has emerged: the accessibility of high-accuracy GNSS positioning through low-cost receivers and smartphones (Marchi et al., 2022). As we delve deeper into this realm, we uncover a transformative era of precision that was once reserved for specialized equipment. This article explores the advancements, implications, and the potential for achieving centimeter-level accuracy through these affordable solutions. Empowering Ubiquity The narrative begins with the widespread adoption of low-cost GNSS technology. This innovation is now not only accessible but also adaptable with minimal investment. The EGSA GNSS

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Sub-Meter Accuracy in Consumer Smartphones: Advancements and Challenges in GNSS Positioning

By • • Knowledge, Research, Teaching • , , , , , , , • 3 minutes of reading

By Shahabuddin Amerudin Sub-meter accuracy in the context of GNSS (Global Navigation Satellite System) refers to the capability of a receiver to determine its position with an accuracy of less than one meter, typically in the range of centimeters or decimeters. This level of accuracy is highly desirable for various applications, including augmented reality, precise navigation, surveying, agriculture, and other location-based services where high precision is crucial. To achieve sub-meter accuracy, GNSS receivers need access to highly accurate and precise satellite positioning data. Traditional consumer-grade GNSS receivers, such as those found in smartphones, typically provide accuracy in the range of

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A Review: Accuracy for the Masses: Real-Time Sub-Meter in a Consumer Receiver?

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By Shahabuddin Amerudin Authors: Joshua Critchley-Marrows, Marco Fortunato and William Roberts Publication Date: April 6, 2020 The article discusses a new methodology aimed at achieving sub-meter Global Navigation Satellite System (GNSS) accuracies in consumer devices such as smartphones. The goal is to enable applications like augmented reality and visually impaired navigation to function with higher precision. The article explores the challenges of achieving high accuracy in mass-market GNSS receivers, especially in the context of real-time positioning. It also introduces an alternative approach to Precise Point Positioning (PPP) to improve accuracy in challenging receiver environments. Key Points: Conclusion The article presents

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Understanding Location Accuracy Requirements in Various Applications

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By Shahabuddin Amerudin Introduction Location accuracy plays a vital role in numerous applications, enabling precise positioning, navigation, and tailored experiences. Different applications have varying location accuracy requirements based on their specific use cases and objectives. In this article, we explore a range of applications and their location accuracy needs, spanning from high accuracy requirements in the millimeter range to general accuracy needs within a few meters. Conclusion It’s important to note that these accuracy ranges are general guidelines and can vary depending on specific application requirements and user expectations. Additionally, advancements in technology, such as the availability of higher-quality GNSS

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Understanding Location Accuracy in Consumer Smartphones

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By Shahabuddin Amerudin Introduction Consumer smartphones have become integral to our daily lives, offering a wide range of features and functionalities, including location-based services. The accuracy of location information provided by smartphones is crucial for navigation, mapping, and various location-dependent applications. In this article, we explore the general capabilities of consumer smartphones in achieving location accuracy and the factors that influence it. GPS Technology and Accuracy Global Positioning System (GPS) is a widely used positioning technology in smartphones. With high-quality GPS receivers, smartphones can achieve location accuracy within a few meters under ideal conditions. GPS relies on signals from satellites

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Understanding Location Inaccuracy in Mapping Applications

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By Shahabuddin Amerudin Introduction Location accuracy plays a crucial role in mapping applications, allowing users to navigate, find points of interest, and track their movements. However, it’s important to acknowledge that location inaccuracy can sometimes occur, leading to discrepancies between the displayed location and the user’s actual position. In this article, we explore the various factors that contribute to location inaccuracy and discuss strategies to mitigate its impact on mapping applications. GPS Accuracy GPS (Global Positioning System) relies on satellite signals to determine precise location coordinates. However, several factors can affect the accuracy of GPS signals. Device limitations, such as

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Strategies for Lowering Positioning Accuracy in GIS Databases: Balancing Privacy and Precision

By • • Knowledge, Research, Teaching • , , , , , , • 3 minutes of reading

Suggestion for Citation: Amerudin, S. (2023). Strategies for Lowering Positioning Accuracy in GIS Databases: Balancing Privacy and Precision. [Online] Available at: https://people.utm.my/shahabuddin/?p=6291 (Accessed: 9 April 2023).

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GNSS for Underwater

By • • Knowledge, Research, Teaching • , , , • 1 minute of reading

The optimal arrangement of buoys is determined in terms of accuracy and availability depending on the number of available buoys and targeted water depth for an efficient operation. For example, at a targeted depth of 30 m in fresh water, a maximum horizontal position root-mean-square (RMS) error of less than 3 m can be achieved with a set of five buoys providing a service radius of up to 72 m. https://doi.org/10.3390/rs12213636 The formal transfer of GNSS under water is not possible. The radio signals don’t reach very far underwater, they’re basically useless for any submarine below the surface. If it is

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Location Privacy

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Beresford and Stajano define location privacy as “the ability to prevent other parties from learning one’s current or past location.” This definition specifies that the data subject—or the person whose location data is affected—should have control over the use and subsequent use of their data, which can be viewed as an extension of the previously presented definition of privacy. The device’s physical location can be determined using one of three methods: (1) satellite navigation systems like the Global Positioning System (GPS), (2) mobile carrier antennas, and (3) wireless networks. A device can use any combination of these three methods to

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